Subject: op-amp for a regulated power supply(linear,series pass)...
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Date: Fri, 15 Nov 2002 16:18:37 -0500
NNTP-Posting-Date: Fri, 15 Nov 2002 16:17:07 EST
Organization: Bell Sympatico
Hi everyones...thanks to read!
I'm designing a power suppy/battery charger for
a friend's camcorder. He then will be able to
power is camcorder at home as a webcam or wathever
when charging a battery for it at the same time, with the
same unit. I have an op-amp remaining from an LM324 IC
that i want to use for the camcorder's 6.5V regulated power
supply section. Since i did a lot of power supplies for my
projects,but like many ones i've used a regulator IC,
especially the 78XX series,(the easy way!) i did not really
gained experience and basics. I breadboarded the thing
and tested it, but as i expected i had some stability problems.
(see the link lower on this message)
I've checked on Google with tens of keywords combinations
for "power supply" "regulated" "op-amp"...ect...
i've found a lot of infos,but not exactly what i wanted. Found more
about Low Dropout regulators(LDO) ICs, and switching power
supplies. But with the few infos i've found...i think i did something
that is performing. I've also added a capacitor in the feedback
loop and things are more stable than ever. However since i'm
not 100% shure about the reliability of what i've done...i need
(please?!!) some comments about my schematic and if possible
a link where i can find infos about regulators made of op-amps.
I have the background, i know what is rectifying, filtering, how to
choose the proper filter capacitor...but for the regulator itself i lack
some infos. I have the reference"Building Power Supplies" from
Radio Shack by David Lines...but again most of the linear projects
are made from 3-terminal 78XX regulators, and it's not what i call
learning about the principles of voltage/current regulation!
Alain (alias:Kilowatt) Montreal Quebec
P.S: Excuse me for some errors or omissions,since
I'm a «pure» French Canadian :-)
If replying also by e-mail,remove"no spam"
(with the quotes) from my adress...thanks!
Come to visit me @: http://kilowatt.camarades.com